I enjoy playing with mesmer.
I'm just not a fan of clones, and much rather have a gw1 type mesmer with loads of interrupts and hexes.
Every weapon mesmer has, deploys a clone or two, according to its skills.
An idea for a mesmer elite spec would be to replace all clones, and interrupt foes instead, with various effects.
I really love mesmer in gw1 and their skills.
A second alternative is to replace the F keys into copycat abilities to disable and copy skills from foes and able to use them once, following by a recharge.
Thief does that, but thieves should instead steal, as it says on the tin, not copy random skills.
Thieves should steal weapons and items.